Do leaves in Cyperoideae (Cyperaceae) have a multiple epidermis or a hypodermis?

Martins, Shirley; Pilatti, Vanesa; Vegetti, Abelardo Carlos; Scatena, Vera Lúcia

doi:10.1016/j.flora.2012.02.004

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…Although there are several anatomical studies of vegetative organs of Rhynchospora (e.g. Govindarajalu 1969;Metcalfe 1969;Thomas 1984;Martins et al 2012;Martins and Scatena 2011;Lucero et al 2014), for the floral anatomy there is few available information (e.g. Baillon 1893 ;Snell 1936;Saunders 1937;Blaser 1941a, b;Reynders et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Comparative floral anatomy of Rhynchospora consanguinea and Rhynchospora pubera (Cyperoideae, Cyperaceae)

2016

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Rhynchospora is one of the most species-rich genera of Cyperaceae and one of the few with entomophilous species. Considering the few anatomical studies of the genus, especially of the reproductive structures, this study comparatively analysed the anatomy of flowers of two representative species of Rhynchospora, R. consanguinea and R. pubera, including the floral vasculature and the anatomy of the style base, which is persistent with the fruit. Both species have congested inflorescences with light-coloured bracts and bisexual flowers, and phenolic idioblasts in the anthers and gynoecium, characteristics that suggest insect pollination. In R. consanguinea, the bisexual and the most proximal male flower has perianths, a new character state reported for the genus. The floral vasculature pattern is similar in both species, but differs from that previously described for Rhynchospora. In both species, there are two vascular bundles in the rachilla, which split into three receptacular bundles, the latter forming a vascular plexus where the bundles of stamens, gynoecium and ovule are connected. No lateral carpellary trace was observed, and the presence of the abaxial receptacular bundle was interpreted as a vestige of the tricarpellate ancestral condition. In the fruit of both species, the thickened style base (stylopodium) has a parenchyma with idioblasts containing phenolic compounds and idioblasts with helical or reticulate cell wall thickenings. The stylopodium is a homologous structure in the species of Rhynchospora and to other genera of Cyperoideae and evolved several times in the subfamily.

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Section: Introductionmentioning

confidence: 99%

Comparative floral anatomy of Rhynchospora consanguinea and Rhynchospora pubera (Cyperoideae, Cyperaceae)

2016

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“…La cuarta especie con epidermis múltiple es Fimbristylis complanata, cuya epidermis está enteramente formada por un par de capas de células. Martins et al (2012) ya se preguntan si las hojas de Cyperoideae (Cyperaceae) tienen hipodermis o epidermis múltiple, confirmando mediante estudios ontogenéticos esta última opción, incluyendo en dicho estudio a F. complanata.…”

Section: Epidermisunclassified

Anatomía foliar de especies predominantes en bosques y pastizales del Iberá

2023

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El macrosistema Iberá presenta diversos tipos de vegetación, donde además de las acuáticas y palustres hay bosques hidrófilos, sabanas con predominio de gramíneas y praderas con especies arbustivas intercaladas entre las herbáceas. Estudios previos de anatomía foliar solo fueron realizados en plantas acuáticas y palustres. En este trabajo se estudió la anatomía foliar en especies predominantes o frecuentes que crecen en pastizales y bosques del macrosistema Iberá, con el objetivo de detectar caracteres estructurales de las hojas que puedan representar valor adaptativo a estos ambientes. Se analizaron hojas de 42 especies correspondientes a 26 familias, con microscopía óptica y electrónica de barrido. Se realizó un análisis estadístico en base a una matriz de datos, compuesta por los caracteres anatómicos y el ambiente en que crecen las especies estudiadas. Los caracteres analizados de la epidermis fueron: diseño de la cutícula, estomas, tricomas, diseño de células epidérmicas de ambas epidermis, donde se observa un predominio de idéntica morfología en ambas caras. En el mesofilo se evaluó su tipo, presencia y forma de cristales de calcio e inulina, y distribución de estructuras glandulares como laticíferos, cavidades y células secretoras. Los datos reportados son discutidos en relación a la bibliografía disponible. El análisis de agrupamiento (UPGMA) muestra que las especies que habitan en los mismos ambientes no presentan características anatómicas similares.

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“…Alves et al (2002) used the presence of hypodermis in leaf organs to differentiate Hypolytrum from Mapania which is clearly not appropriate based on the data here presented. Martins et al (2012) report a variation between hypodermis and multiple epidermis in various genera of Cyperaceae and present a schematic hypothesis to explain the ontogeny of these tissues up to maturity. In the present study, only mature leaves were analyzed and the tissue pointed out as hypodermis is constituted of cells whose size and shape are quite different from those of the epidermis.…”

Section: Amazonicamentioning

confidence: 99%

Importance of anatomical leaf features for characterization of three species of Mapania (Mapanioideae, Cyperaceae) from the Amazon Forest, Brazil

2014

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Mapania belongs to Mapanioideae, a quite controversial subfamily in Cyperaceae due to the existence of unusual characters in both reproductive and vegetative organs. The genus is represented by seven species in Northern Brazil but taxonomic valuable information related to the leaf organs is still unknown. The present study aimed the anatomical description of the leaf organs (either basal leaves or cataphylls and involucral bracts) of three representative Brazilian species of Mapania. Samples of cataphylls, basal leaves and involucral bracts were sectioned and stained for observations under light microscopy. The involucral bracts provide the most elucidative characters (ten) to distinguish the three species The basal leaves provides six distinguishing characters and are useful to M. macrophylla and M. pycnostachya, as they are absent in M. sylvatica. Mesophyll arrangement in the involucral bracts supports the circumscription of M. macrophylla and M. pycnostachya in M. sect. Pycnocephala and of M. sylvatica in M. sect. Mapania. Some features as thin-walled epidermal cells, stomata level and aerenchyma were considered to be adaptive to the humid environment in which the species occur. The translucent cells are here considered as aerenchyma precursors and a supportive function is assumed for the bulliform cells on the basal leaves and involucral bracts. No silica bodies were found which confirm it as a diagnostic character of Mapania among Hypolytreae genera. KEYWORDS: aerenchyma, cataphylls, Hypolytreae, involucral bracts, Poales Importância dos caracteres anatômicos foliares na caracterização de três espécies de Mapania (Mapanioideae, Cyperaceae) da Floresta Amazônica, Brasil RESUMO Mapania pertence à subfamília Mapanioideae que apresenta caracteres incomuns às demais Cyperaceae, tanto vegetativos como reprodutivos. O gênero é representado por sete espécies no norte do Brasil e apresenta ainda lacunas de informações especialmente relacionadas aos órgãos foliares. O presente estudo objetivou a descrição anatômica dos órgãos foliares (folhas basais, ou catafilos, e brácteas involucrais) de três espécies representativas de Mapania no território brasileiro. Amostras de catafilos, folhas basais e brácteas involucrais foram seccionadas e coradas para observações em microscopia de luz. As brácteas involucrais foram as mais elucidativas na separação das espécies, com dez caracteres variáveis, uma vez que ocorrem em todas as espécies durante o estágio reprodutivo. As folhas basais forneceram seis caracteres úteis na distinção de M. macrophylla e M. pycnostachya, já que não ocorrem em M. sylvatica. seguidas das folhas basais. O arranjo do mesofilo das brácteas involucrais suporta a circunscrição de M. macrophylla e M. pycnostachya em M. sect. Pycnocephala e de M. sylvatica em M. sect. Mapania. Características adaptativas ao ambiente úmido também foram encontradas, como epiderme com paredes delgadas, níveis dos estômatos e presença de aerênquima. As células translúcidas do mesofilo foram descritas como precursoras de...

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Do leaves in Cyperoideae (Cyperaceae) have a multiple epidermis or a hypodermis?

Cited by 6 publications

References 27 publications

Comparative floral anatomy of Rhynchospora consanguinea and Rhynchospora pubera (Cyperoideae, Cyperaceae)

Comparative floral anatomy of Rhynchospora consanguinea and Rhynchospora pubera (Cyperoideae, Cyperaceae)

Anatomía foliar de especies predominantes en bosques y pastizales del Iberá

Importance of anatomical leaf features for characterization of three species of Mapania (Mapanioideae, Cyperaceae) from the Amazon Forest, Brazil

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